package com.atguigu.service;

import com.alibaba.dubbo.config.annotation.Reference;
import com.atguigu.pojo.Permission;
import com.atguigu.pojo.Role;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.User;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Component;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;

/**
 * @author Eric
 * @Create 2020-09-22  11:00
 * @Version project-workspace-0912
 **/
@Component
public class SpringSecurityUserService implements UserDetailsService {

    @Reference
    private UserService userService;

    //根据用户名查询用户信息
    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        //通过dubbo远程服务，根据用户名查询用户信息
        com.atguigu.pojo.User user = userService.findUserByUsername(username);
        if(user == null)
        {
            //用户未注册，抛出异常UsernameNotFoundException
            return null;
        }
        List<GrantedAuthority> list = new ArrayList<>();
        Set<Role> roles = user.getRoles();
        for (Role role : roles) {
            Set<Permission> permissions = role.getPermissions();
            for (Permission permission : permissions) {
                list.add(new SimpleGrantedAuthority(permission.getKeyword()));
            }
        }
        /**
         * User()
         * 1.指定用户名
         * 2.指定密码(SpringSecurity会自动对密码进行校验)
         * 3.传递授予角色和权限
         */
        return new User(username,user.getPassword(),list);
    }



}
